Reference for Bava Batra 57:8

דאמר ליה חברך חברא אית ליה וחברא דחברך חברא אית ליה

— Raba therefore [again corrected himself and] said: For one year a man takes care of his title-deed, and so for two, three years does he take care; beyond that he does not take care. Said Abaye to him: If that is so, then [it would follow that] a protest made not in the presence of the holder is no protest, since the latter can say, 'If you had protested to me personally, I should have taken more care of my title-deed'? — The other can retort, '[You must have known of my protest because] your friend has a friend and your friend's friend has a friend.'<span class="x" onmousemove="('comment',' V. supra p. 140. ');">⁸</span>

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